Luma Ray 3.2 video_reframe: 10-second source, no 1080p vertical

Luma's video_reframe outpaints an existing video to a new aspect ratio, so the model invents the newly exposed canvas. The source must be 10 seconds or shorter, and 1080p is not yet available for 9:16 and 3:4 targets. Sume does not outpaint: it crops a Sume-hosted clip.

Luma's limits are from its reframe guide; Sume's from the Video filter docs, read 2026-10-01.

What are Luma's reframe limits?

What does Sume do instead?

Video filter 1.0 takes one Sume-hosted clip and applies a crop op, with x, y, width and height as fractions of the source frame, then returns a new MP4. The source is untouched. Nothing is generated to fill space: you keep a region of what is already there. The docs list a source cap of 300 seconds.

curl -X POST https://api.sume.com/v1/video-filter \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: video-filter-crop-001" \
  -d '{
    "video_url": "https://media.sume.com/artifacts/artf_demo/talk.mp4",
    "ops": [{ "op": "crop", "x": 0.34, "y": 0, "width": 0.32, "height": 1 }]
  }'

How do I get a vertical 9:16 result?

Crop a centered column from a landscape clip, as above. The crop is a fraction, so the width fraction for 9:16 from 16:9 is about 0.316. Timeline 1.0's default output is 1080x1920 MP4, so a cropped clip placed in a timeline renders vertical. Use POST /v1/video-filter/check first; it is unbilled.

More on the trade-offs in reframe a video after generation.

When is outpainting the better fit?

When you must keep the whole frame and accept generated edges. Cropping drops the sides. If the subject spans the width, a crop will cut it, so check the framing before you choose.